肾上腺髓质素在糖尿病肾病中的变化及作用

The role of adrenomedullin in diabetic nephropathy

目的 :探讨肾上腺髓质素 (AM)在糖尿病肾病中的变化及作用。方法 :通过体外人肾小球系膜细胞培养实验 ,观察高糖条件对系膜细胞AMmRNA、转化生长因子 - β1(TGF - β1)mRNA表达、分泌及细胞外基质 (层粘连蛋白和Ⅳ型胶原 )含量的影响及肾上腺髓质素干预对高糖不良作用的影响。结果 :在高糖条件下培养的人肾小球系膜细胞AMmRNA、TGF - β1mRNA表达和AM、TGF - β1分泌较低糖对照组分别增加 1 0 1倍、0 5 9倍和 3 4 9倍、1 6 1倍 ;细胞外基质蛋白LN和Ⅳ型胶原含量分别升高 0 95倍和 1 13倍。用不同浓度AM(10 -7、10 -8和 10 -9mol/L)干预后 ,TGF - β1mRNA表达分别下降 5 0 %、2 8%和 16 2 % ,TGF - β1含量分别下降 39%、2 6 %和 11% ;LN含量分别下降 5 3%、4 5 %和 18% ,Ⅳ型胶原含量分别下降 2 9%、2 6 %和 2 0 %。结论 :葡萄糖水平升高是AM表达分泌的剌激因子之一。AM的肾脏保护作用可能与抑制TGF - β1的表达与分泌 ,进而减少基质蛋白和胶原的过度积聚相关。

AIM: To investigate the role of adrenomedullin (AM) in diabetic nephropathy. METHODS: We observed the changes in the expression and secretion of AM, TGF-β 1 in the cultured human mesangial cells under high glucose condition and the contents of the laminin and type IV collagen in the supernatants. The effect of intervention with AM was also observed. RESULTS: High glucose condition resulted in increase in the expression and secretion of AM TGF-β 1 laminin and type IV collagen. AM reversed the influence of high glucose on the cultured human mesangial cells. CONCLUSION: These results showed that high glucose condition is one of stimulating factors of AM and the renal protective action of AM may be associated with suppression of TGF-β 1 and reducing excessive accumulation of laminin and type IV collagen.